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PSL300H1 Chapter Notes - Chapter 15: Foam Cell, Blood Vessel, Function Model

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31 May 2014
School
UTSG
Department
Physiology
Course
PSL300H1
Professor
all

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Related Questions


Smoking tobacco is bad for your circulatory health. In an attemptto maintain the blood's capacity to deliver oxygen, the bodyincreases its red blood cell production, and this increases theviscosity of the blood. In addition, nicotine from tobacco causesarteries to constrict. For a nonsmoker, with blood viscosity of2.5x10^-3 Pa*s, normal blood flow requires a pressure difference of8.0 mm of Hg between the two ends of an artery. If this person wereto smoke regularly, his blood viscosity would increase to 2.7x10^-3 Pa*s, and the arterial diameter would constrict to 90% ofits normal value. What pressure difference would be needed tomaintain the same blood flow?

Consider a human artery with a blood clot. Assume that theclotreduces the effective
area by 75 per cent and the density of blood is 1060 kg/m3. Ifthespeed of the blood
flow in the unobstructed region of the artery is 20 cm/s,assumingsteady flow,
(a) calculate the speed of the blood flow at the clot.
(b) What is the pressure change (compared to the pressure intheunobstructed part
of the artery) at the clot?

Peripheral resistance ________.

a. increases as blood vessel diameter increase

b. increases as blood viscosity increases

c. decreases with the increasing length of the blood vessel

d. is not a major factor in blood pressure in healthy individuals